Setting up the Parser The following code sets up the parser and gets it started: This time, you should see the following fatal error message. Note that when the startElement method is invoked, if namespace processing is not enabled, then the local name for elements and attributes could turn out to be an empty string. Ideally a good parser should be fast time efficient ,space efficient, rich in functionality and easy to use. The startElement method then populates the hash map created by startDocument with the local names and the counts thereof, for each type of element. Element Events As mentioned in Document Events , the hash table created by the startDocument method needs to be populated with the various elements that the parser finds in the document.
Note that when the startElement method is invoked, if namespace processing is not enabled, then the local name for elements and attributes could turn out to be an empty string. Setting up Error Handling You could start using your parser now, but it is safer to implement some error handling. But a SAX parser does not create any internal structure. What if what the instructor wants to do is not to print a list, but to save the original document back with the grade of each student updated? Also we assume that in his application, the instructor use no data structure such as arrays to store the student personal information and the points. What if he creates his own data structure, such as an array of strings to store the SSN and an array of integers to sto re the points? You will learn more about those methods later in this lesson. Write a Java program to extract all the information about circles which are elements in a given XML document. Of course, you could always override the fatalError method to throw a different exception. This takes considerable time and space for large documents memory allocation and data-structure construction take time. The most trivial example is that an attribute declared in the DTD to be of type IDREF, requires that there be only one element in the document that uses the same value for an ID attribute. The Java implementation of SAX is considered to be normative. When a start tag or end tag is encountered, the name of the tag is passed as a String to the startElement or the endElement method, as appropriate. When a fatal error occurs, the parser cannot continue. Additionally, some kinds of XML processing simply require having access to the entire document. Thus in the example above, a SAX parser may generate a different series of events, part of which might include: Element Events As mentioned in Document Events , the hash table created by the startDocument method needs to be populated with the various elements that the parser finds in the document. What he wants to produce, is a list with the SSN and the grades. For example, XML attributes are typically provided as name and value arguments passed to element events, but can also be provided as separate events, or via a hash table or similar collection of all the attributes. Virtually any kind of XML validation requires access to the document in full. Because of the event-driven nature of SAX, processing documents is generally far faster than DOM-style parsers, so long as the processing can be done in a start-to-end pass. Warnings are informative and can only be generated in the presence of a DTD or schema. With DOM parser, method calls in client application have to be explicit and forms a kind of chain. The exact names for given event types also vary slightly between implementations. In this case, I think SAX is a better choice, before this could save both memory and time as well, yet get the job done.
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